EP0453734A3 - Modem comprising saw filters having opposite pass band delay characteristics - Google Patents

Modem comprising saw filters having opposite pass band delay characteristics Download PDF

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Publication number
EP0453734A3
EP0453734A3 EP19910102934 EP91102934A EP0453734A3 EP 0453734 A3 EP0453734 A3 EP 0453734A3 EP 19910102934 EP19910102934 EP 19910102934 EP 91102934 A EP91102934 A EP 91102934A EP 0453734 A3 EP0453734 A3 EP 0453734A3
Authority
EP
European Patent Office
Prior art keywords
modem
pass band
delay characteristics
saw filters
band delay
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19910102934
Other versions
EP0453734A2 (en
Inventor
Takumi C/O Nec Corporation Deguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of EP0453734A2 publication Critical patent/EP0453734A2/en
Publication of EP0453734A3 publication Critical patent/EP0453734A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
EP19910102934 1990-02-27 1991-02-27 Modem comprising saw filters having opposite pass band delay characteristics Withdrawn EP0453734A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP47659/90 1990-02-27
JP2047659A JPH03249847A (en) 1990-02-27 1990-02-27 Modulation/demodulation device

Publications (2)

Publication Number Publication Date
EP0453734A2 EP0453734A2 (en) 1991-10-30
EP0453734A3 true EP0453734A3 (en) 1993-02-10

Family

ID=12781386

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910102934 Withdrawn EP0453734A3 (en) 1990-02-27 1991-02-27 Modem comprising saw filters having opposite pass band delay characteristics

Country Status (5)

Country Link
US (1) US5231647A (en)
EP (1) EP0453734A3 (en)
JP (1) JPH03249847A (en)
AU (1) AU629462B2 (en)
CA (1) CA2037090C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH066111A (en) * 1992-06-18 1994-01-14 Mitsubishi Electric Corp Composite duplex filter
US5764693A (en) * 1994-11-14 1998-06-09 Research In Motion Limited Wireless radio modem with minimal inter-device RF interference
US5619531A (en) * 1994-11-14 1997-04-08 Research In Motion Limited Wireless radio modem with minimal interdevice RF interference
US5787117A (en) * 1996-01-26 1998-07-28 Rf Monolithics, Inc. Receiver/transmitter having common elements

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659231A (en) * 1971-03-17 1972-04-25 Zenith Radio Corp Multi-stage solid-state signal-transmission system

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220084B2 (en) * 1972-09-19 1977-06-01
JPS51107742A (en) * 1975-03-18 1976-09-24 Murata Manufacturing Co DANSEIHYOMENHAFUIRUTA
JPS51107743A (en) * 1975-03-18 1976-09-24 Murata Manufacturing Co DANSEIHYOMENHAFUIRUTA
JPS51107741A (en) * 1975-03-18 1976-09-24 Murata Manufacturing Co DANSEIHYOMENHAFUIRUTA
JPS5762615A (en) * 1980-10-01 1982-04-15 Oki Electric Ind Co Ltd Surface acoustic wave filter
JPS5820021A (en) * 1981-07-30 1983-02-05 Nippon Hoso Kyokai <Nhk> Filter device for surface acoustic wave
US4546322A (en) * 1983-08-24 1985-10-08 Reliance Electric Company Adaptable demodulator for arbitrary amplitude and phase keyed modulation signals
AU589084B2 (en) * 1986-02-08 1989-09-28 Nec Corporation Multilevel modulator capable of producing a composite modulated signal comprising a quadrature amplitude modulated component and a phase modulated component
US4694266A (en) * 1986-07-29 1987-09-15 R. F. Monolithic, Inc. Notch filter
JP2595961B2 (en) * 1987-04-03 1997-04-02 日本電気株式会社 Digital modulation and demodulation system
US4890316A (en) * 1988-10-28 1989-12-26 Walsh Dale M Modem for communicating at high speed over voice-grade telephone circuits
US5048054A (en) * 1989-05-12 1991-09-10 Codex Corporation Line probing modem
JPH0687541B2 (en) * 1989-06-22 1994-11-02 シャープ株式会社 Quadrature amplitude modulation wave demodulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659231A (en) * 1971-03-17 1972-04-25 Zenith Radio Corp Multi-stage solid-state signal-transmission system

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
1982 ULTRASONICS SYMPOSIUM, 27.-29.10.1982, San Diego, US, vol. 1, pages 23-28, IEEE, New York, US; W.R. MADER et al.: 'Universal Method for Compensation of SAW Diffraction and other Second Order Effects'. *
1983 ULTRASONICS SYMPOSIUM, 31.10.-02.11.1983, Atlanta, US, vol. 1, pages 17-22, IEEE, New York, US; E. EHRMANN-FALKENAU et al.: 'SAW-Filters for Spectral Shaping in a 140 Mbit/s Digital Radio System using 16 QAM'. *
IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE GLOBECOM '83, 28.11.-01.12.1983, San Diego, US, vol. 1, pages 296-301, IEEE, New York, US; J. A. NOSSEK & H. BARTH: '16-State QAM-Modem for a 140 Mbit/s Digital Radio System Family.' *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 136 (E-120)(1014) & JP-A-57 62 615 ( OKI DENKI KOGYO K.K. ) *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 99 (E-172)(1244) & JP-A-58 20 021 ( NIPPON HOSO KYOKAI ) *
R.W.LUCKY, J.SALZ, E.J.WELDON: 'Principles of Data Communication' 1968 , MCGRAW-HILL , NEW YORK, US *

Also Published As

Publication number Publication date
US5231647A (en) 1993-07-27
EP0453734A2 (en) 1991-10-30
CA2037090C (en) 1995-01-03
AU629462B2 (en) 1992-10-01
JPH03249847A (en) 1991-11-07
AU7195091A (en) 1991-08-29

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